Just how much of your Web behavior is actually tracked by data aggregators? Well, Google and its affiliates alone track visitor identities on nearly two-thirds (64.4%) of worldwide Web browsing, according to a study by anti-tracking vendor Ghostery. Facebook trailed with trackers for a mere 28.8% of all page visits. Ghostery found 77.4% of pages had at least one tracker while more than 15% of pages had ten or more.

Here’s an alliance between data vendors. Time Inc.-owned Viant, which has an advertising audience database of 1.2 billion registered users, is adding information from retail data aggregator IRI. Marketers will get a clearer picture of advertising results at fine levels of detail, although not tied to identified individuals.

Remember the good old days, when lying was considered unacceptable? The folks at Iron Tribe Fitness, a South Carolina gym, are holding Meta to that forgotten standard in a class action suit alleging that Facebook overcharged advertisers as much as $4 billion by using one type of auction bidding process while claiming to use another.  Meta blames the error on a “software glitch” that began in 2013 and continued for at least four years.